利用还原法制备纳米银溶胶,采用改进的St(o)ber法分别于乙醇和正丁醇溶剂中制备Ag@SiO2.透射电镜(TEM)表明在乙醇溶刺中实现了包覆,X射线衍射(XRD)表明纳米银具有规则的面心立方结构,X射线光电子能谱(XPS)则进一步表明银颗粒表面构筑了SiO2壳层.壳层厚度对银溶胶的光谱性质有显著影响,紫外可见吸收光谱表明最大吸收峰发生红移;荧光光谱表明SiO2壳层的包覆使纳米银的激发和发射光谱强度降低.
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